Hi caroline_w_uk
Thank you for posting.
It sounds like a difficult time for you and it’s understandable that you are worried about having blood tests or injections in your arm on the treated side.
Developing lymphoedema after breast surgery is something that worries most women and over the years there has been conflicting evidence around lymphoedema and how to reduce the risk of this happening. Currently there is no consistent evidence of increased risk of lymphoedema associated with medical procedures (for example, blood tests, injections, intravenous medicines and blood pressure measurement) on the treated side.
With this in mind, decisions about using the arm on the treated side for medical procedures are managed on a case-by-case basis and may vary depending on the practices and protocols of treatment teams. The most recent NICE guidance (2025) indicates that a shared decision be made about using the arm on the treated side for medical procedures. Decisions are based on the person’s preference and clinical judgement, considering the individual person’s clinical need and the possibility of alternatives.
As @JoanneN indicated, we would suggest that you contact your breast care nurse or treatment team to discuss this. They will be aware of your individual situation and are in the best position to advise and guide you about how to proceed.
You may find our booklet on reducing the risk of lymphoedema a helpful read.
We also offer a range of free supportive services which you may be interested in. They include face to face and online courses and events.
You are welcome to call our helpline if you would like to talk this through or have any further questions. The helpline team have time to listen, talk things through and signpost you to additional support and information if necessary. Your call will be confidential, and the number is free from UK landlines and all mobile networks.
The number is 0808 800 6000. If you have hearing or speech difficulties prefix our number with 18001 and the call will go through Relay UK. Our helpline has access to telephone interpreters if language translation is required.
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Best wishes
Eve
Breast Care Nurse
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